Two customers and an employee at the Blue Ridge Savings Bank were killed Friday afternoon at a branch located in a small trailer not far from Greer's biggest employer _ BMW Manufacturing Corp.

Greer police said Saturday that investigators were following up on about 75 leads, and were hoping an enhanced videotape would reveal the identities of two suspects or a better description of the car they drove.

Greer Police Chief Dean Crisp said officers were looking for two people in a red or burgundy sedan in connection with the robbery. Investigators were uncertain even of the gender of the robbers.

Authorities said there was no sign of a struggle. Crisp said money was taken, but the amount was not known.

The victims were killed with a large-caliber handgun, authorities said. Crisp said another employee had stepped out before the robbery.

Workers at a nearby construction site saw two people drive away from the bank shortly before police arrived in response to an alarm from inside the bank, Crisp said.

That panic alert was received about 15 minutes after David Holtzclaw left after stopping to deliver lunch to his mother, Sylvia, who was working alone at the bank.

Sylvia Holtzclaw wasn't supposed to be working Friday and had told a friend that morning she worried about working in the bank by herself. "She frequently expressed concern for her safety," Robbie Gravley told the (Spartanburg) Herald-Journal.

Holtzclaw's younger son, Kevin, a firefighter, stopped by the bank later and saw the emergency, police and media vehicles. He had to identify his mother's body.

Also killed were two customers, James E. Barnes, a professor at the University of South Carolina-Spartanburg, and his wife, Margaret.

Police questioned customers and workers at Mutt's BBQ just down the road from the bank, said waitress Latasha Jones.

"We had cops come in here _ it was scary," Jones said.

It was the deadliest U.S. bank robbery since Sept. 26, when three gunmen killed five people at a US Bank branch in Norfolk, Neb.